The Titanium Man ("Chelovek-Titan") is the name of two fictional supervillains in the Marvel Comics universe. The original Titanium Man first appeared in Tales of Suspense #69 (September 1965). He was created by Stan Lee and Don Heck.
A light hull (casing in British usage) of a submarine is the outer non-watertight hull which provides a hydrodynamically efficient shape. The pressure hull is the inner hull of a submarine; this holds the difference between outside and inside pressure.